Meal Replacement Supplements Meal replacement supplementscan be a quick fix when you're pressed for time but still want to enjoy all the benefits of a nutritious meal. If you are looking to build muscle or to keep that metabolism burning as fast as possible, it is recommended that you consume 5-6 small protein-rich meals throughout the day. A meal replacement supplement (MRP) may be just what you need. Who has time nowadays to prepare and sit for 5-6 meals a day?